Gram‐Scale Production of Graphene Powder via a Quasi‐physical Process and Its Application in Electrode Material for Lithium‐Ion Battery

Graphene powder is an attractive conducting additive for the electrodes of lithium‐ion battery (LIB). However, the practical application of graphene is hampered by the lack of reliable methods for its production. Here, the authors report a promising method for the synthesis of graphene powder, which exhibits the functionalities both in gram‐scale production and high‐quality products. As a validation, the authors show that the introduced graphene matrix can greatly improve the electrochemical activity and cycle stability of the Co 3 O 4 nanoparticles. Typically, when 40 wt% of graphene is introduced, the obtained Co 3 O 4 /graphene nanocomposite can stably cycle up to more than 50 cycles with a reversible capacity above 530 mAh g −1 . Simultaneously, a limited initial irreversible capacity less than 40 mAh g −1 is also achieved. The attainment of such properties in Co 3 O 4 /graphene nanocomposite offers the prospects for the practical applications of graphene in industry for better LIBs.